Battle of Nyeg Warl is an epic tale about a young woman, Muriel, who must overcome her dark past to learn to sing the Song of Breaking. Armed with the love of Jeaf Oakenfel, who is destined to find the Hammer of Power, she returns to the Cave of Forgetfulness to face the demon who stole her childhood and uncover the song's magic that Nyeg Warl needs to turn back Ar Warl's invading hordes.

Ten winters after using the Song of Breaking's power to defeat Ar Warl's invading hordes, magic as dark as a moonless night returns to threaten Muriel Oakenfel and her unborn child. In the ensuing struggle, the barrier separating the Warl of the Living from the Warl of the Dead is breached, leaving the Prophetess and the Hammer Bearer to face an unexpected and dangerous enemy.